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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c0f51dcab4570eb92d31076263b2209ebd49ae495c413ca746a29d362afe8c76' 
  AND token = 'iwkOz4BBrbOpJ0995alUU7ngd3FTB4+w+pd6UOQT9Pk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}